The original scans are from the Bavarian State Library in Munich.
There are no rights. The item is public domain in all countries. Most countries' term is life of the author plus 50 years. Zahn (the author) died in 1895. The EU which includes Germany, the country of origin, has a term of 70 pma (life plus 70 years). Zahn died 122 years ago from the year of the upload here (2017). The publication date determines term of copyright in the USA for works first published before 1978, and all works first published before 1923 are public domain in the USA. Vol.1 was published in 1889.
Internet Archive HTML5 Uploader 1.6.3 Bavarian State Library